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When Apple introduced a front-facing camera on its iPhone 4 in 2010, it was supposed to usher in a new form of mobile communication.

It did. Sort of.

Unfortunately, FaceTime didn't work over cellular data connections, so you had to connect to Wi-Fi to use it.

Tango luckily launched its iPhone app a few short weeks after the iPhone 4's launch and its ability to let you video chat over cell networks proved more than valuable.

The app was recently updated to support a push to talk feature, sort of like those old Nextel phones. Besides push to talk, users can make voice calls, text, video chat, and send multimedia messages.

What's unique about Tango is that the service is strong on iOS, but the company is more dedicated to Android. It also has apps on Windows Phone and PCs. Tango supports more than 2,000 Android devices and is the 12th most-downloaded app in all categories.

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The first screen you're brought to is the "Favorites" screen, this is where you can add the people you contact the most. Besides favorites, if you gave the app access to your contacts you can view all of your contacts that already have Tango installed and become friends with them.

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In the past, what made Tango stand out was its ability to video chat over cellular. FaceTime can video over cellular now, for certain carriers, but Tango lets you push to talk, send text, send pictures and even, play games while video chatting.